A Single-Molecule Digital Full Adder

Abstract

A specifically designed aza-starphene molecule is presented where contacting one, two and/or three single Al ad-atoms allows this molecule to function as a "3-inputs & 2-outputs" digital full adder on a Au(111) surface. Sequentially positioning single Al ad-atoms, with an atomic precision, to interact with aza-starphene inputs one classical digit per Al, which is converted to quantum information by the molecule. The intramolecular logical calculations do not require a solid-state digital full adder cascaded like architecture. The measured Boolean truth table results in part from the quantum level repulsion effect and in part from a non-linear magnetic effect also intrinsic to the aza-starphene molecule with its contacted Al ad-atoms.

Compact Implementation of a 1-Bit Adder by Coherent 2-Beam Excitation of a Single Plasmonic Cavity

“…We have developed a systematic tool able to identify the existence of Boolean functions and quantify their robustness by analyzing the 2-dimensional response of the cavity. Interestingly, this tool could be generalized to other paradigms of 2D implementation of logic devices such as nanoelectromechanical , or single molecule ALU, , for which response maps are available. We have found that the Boolean response of the plasmonic ALU is enhanced at the cavity edges, with a spatial dependency that suggests a major role of the wall collisions of the ballistic hot electron in the plasmon-to-NPL momentum conversion.…”

A conceptual framework for designing and analyzing complex molecular circuits

“…For instance, Joachim and co-workers have developed molecular logic gates using low temperature scanning tunneling microscopy and spectroscopy of starphene molecules on gold surfaces by manipulating the electrode-molecule interface. 44,45 A molecular breadboard such as TPm presents an alternative framework to advance molecular electronics by assembling multiple electronic circuits (termed basis circuits) on a single scaffold. Combinations of these basis circuits (2r, 3rm, 3rp, 4r, and 5r) can be accessed in an experimental break-junction setup and mapped to distinct conductance readouts.…”

Multiple silicon dangling-bond charge qubits for quantum computing: a Hilbert-space analysis of the Hamiltonian

“…In 2020 [24], Soe et al introduced a novel tetrabenzophenazine molecule that effectively operated as a XORlike Boolean logic gate. Later in 2021 [25], the same group developed a digital full adder (3-input and 2-output) circuit using an aza-starphene molecule, implemented on a Au(111) surface. In 2021, Croshaw et al [22] examined the formation of continuous dangling bond (DB) wire structures on the hydrogen-terminated silicon (100)−2 × 1 surface.…”